Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ba67f0d71a3970f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-20 14:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 8eeb01c21d3594ebf97dbc1478cae806 SHA-1: c96be7ef2d31264c6bffab496a04eafba0db1de5 SHA-256: 6ba67f0d71a3970ff86a1f15e923c9eb71fba6c476424fa86c1acf384e7b52b7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links to various domains, suggesting a link farm designed to obscure the ultimate destination or distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via the embedded JavaScript and external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://insp.biz/img/file/56188284794.pdf In PDF document text
    • http://to-kajihan.net/js/upload/files/nibisawoxikizof.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/zefonaxudixajebogowir.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/11718203779.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/13308029959.pdfIn PDF document text
    • http://apcmagon.com/userfiles/xeruxegavitivasuneno.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/79384463912.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/kuwizemadipibuj.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/27314427495.pdfIn PDF document text
    • http://merwepizza.com/upload/file/potawuvesepuziwelu.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/40433665150.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/62666337683.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/zisowitoj.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/b61e80b638bb347cba6591cc70e87d4e/nadusarijovemuwofamexo.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/gelabetowozoperowuwelu.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/92961979558.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/sofibasivezax.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/87654536887.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/figetijisuduwekutufomaku.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf889695a1---bukedita.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/92364949439.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/defusebidamawekowetinida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=android+switch+back+and+menu+buttonsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 10988 bytes
SHA-256: 1a6aa160f9a18dcf1afc052af44011edc44cb2f9fbaa68f2a6df80059a3086e5
font_02_sfnt_off0001097f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097F 17140 bytes
SHA-256: c271c09e29496ee284be5f4b919f90a3d6f84b1399715e617515782e553283bb

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